Primary 4 Mathematics · Chapter 13 · Answers and explanations
Lesson 13.3: Faces, Edges and Vertices (answers)
Section A · Multiple choice 4 marks
1. How many faces does a cube have?1 mark
(A) 6(B) 4(C) 8(D) 12
Answer: (A) 6Top, bottom, front, back, left, right: 6 faces.
2. How many vertices does a square pyramid have?1 mark
(A) 4(B) 5(C) 6(D) 8
Answer: (B) 54 on the base and 1 at the top: 5 vertices.
3. How many edges does a triangular prism have?1 mark
(A) 6(B) 5(C) 9(D) 12
Answer: (C) 93 on each end and 3 joining them: 3 + 3 + 3 = 9 edges.
4. How many faces does a triangular pyramid have?1 mark
(A) 3(B) 5(C) 6(D) 4
Answer: (D) 4The base and 3 triangles: 4 faces.
Section B · Write your answer 11 marks
5. How many edges does a cuboid have?1 mark
Answer: 124 on the top, 4 on the bottom and 4 going up: 12 edges.
6. How many vertices does a triangular prism have?1 mark
Answer: 63 at each end: 6 vertices.
7. How many edges does a square pyramid have?1 mark
Answer: 84 on the base and 4 going up to the top: 8 edges.
8. What are the faces of a cylinder?1 mark
Answer: 2 flat faces and 1 curved faceThe top and bottom are flat circles. The side is curved.
9. How many vertices does a cone have?1 mark
Answer: 1The point at the top is the only vertex.
10. A solid has 5 faces: 1 square and 4 triangles. (a) Name the solid. (b) How many edges does it have?2 marks
Answer: (a) square pyramid (b) 8A square base with 4 triangles is a square pyramid. It has 4 + 4 = 8 edges.
11. Complete: a cube has ___ faces, ___ edges and ___ vertices.2 marks
Answer: 6; 12; 8Count the faces, edges and corners of a cube.
12. A solid has 5 faces and 2 of them are triangles. (a) Name the solid. (b) How many vertices does it have?2 marks
Answer: (a) triangular prism (b) 62 triangles and 3 rectangles make a triangular prism. It has 6 vertices.
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